The sum of three numbers is 19. The third number is eleven less than five times the second number. If the first number is quadru
ple the amount of the second number, what is the value of the third number?
1 answer:
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now, for a rational expression, the domain, or "values that x can safely take", applies to the denominator NOT becoming 0, because if the denominator is 0, then the rational turns to undefined.
now, what value of "x" makes this denominator turn to 0, let's check by setting it to 0 then.
so, the domain is all real numbers EXCEPT that one.